If $\Delta $U and $\Delta $W represent the increase in internal energy and work done by the system respectively in a thermodynamical process, which of the following is true ?
$\Delta $U = $-$$\Delta $W, in an adiabtic process
$\Delta $U = $\Delta $W, in an isothermal process
$\Delta $U = $\Delta $W, in an adiabatic process
$\Delta $U = $-$ $\Delta $W, in an isothermal process
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